Question

The mean of daily wage earned by four labourers is Rs 180. If another labourer hari is included in the group the mean daily wage goes up to Rs 185. Find the daily wage of hari.



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Answer 1

The mean of a data set is basically the sum of all the values in the data set, divided by the number of values.

So, the total value of the data set, is also the mean of the data set, multiplied by the number of values in the data set.

So, mean of 4 labourers = Rs. 180;

So, total wage of 4 labourers = 180 * 4 = Rs.720

After Hari,

Mean of 5 labourers = Rs. 185;

So, total wage of 5 labourers = 185 * 5 = Rs. 925

Increase in total wage after Hari's coming = 925 - 720 = Rs. 205

So, Hari's wage = Increase in total wage of 4 labourers after his coming

= Rs. 205

Answer : Hari's daily wage is of Rs. 205

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